Can't get text and image on same line

I want to put a banner image immediately to the right of some text and I want the text + image to be centered in the page. I’ve tried this code which works fine in a test html file, but not on an Agaeus WP page.

<h1 style="text-align: center;">
	Australasian agents for
	<img src="product_logo.png" width="250" height="31.7" />
</h1>

When I enter this in an Aegaeus WP page (making allowances for the different src file destination), I always get the image sitting below the text, rather than to the right of it. The image is reasonably small, so it’s not about having insufficient width in the page.

Any ideas???